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Modified F20c Engine Builder UK

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Old 07-20-2023, 11:31 PM
  #31  

 
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Originally Posted by johnckeen
They all piston slap, its what forged engines do.
.
Thats not strictly true - old fashioned pot pistons in 2618 with huge expansion rates with lots of clearance to the bore might knock, but modern slipper pistons in a properly machined bore don't knock.

OP - I build these engines for a living and work closely with Clockwise Motion (who are absolutely the best in the business) so If you need any help drop me a line.


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Old 07-21-2023, 12:58 PM
  #32  

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Originally Posted by danwebster
Thats not strictly true - old fashioned pot pistons in 2618 with huge expansion rates with lots of clearance to the bore might knock, but modern slipper pistons in a properly machined bore don't knock.

OP - I build these engines for a living and work closely with Clockwise Motion (who are absolutely the best in the business) so If you need any help drop me a line.
Oh fantastic, thanks. I haven't had a further response from Ian and Clockwise but I will take you up on that offer, thank you.
Old 07-21-2023, 02:54 PM
  #33  

 
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Had a chat with Ian a while ago,very creative with tech & know how,spray coatings is an option also,very busy in race season though
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Old 07-21-2023, 02:59 PM
  #34  

 
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Originally Posted by nomadicS2k
I had no idea they were £££££££
https://www.billhigham.co.uk/product...25hp-outboard/
£30k!
Wow. By comparison my Hyabusa V8 is a bargain lol

Time warp.. some old old ****ers on this thread

https://www.s2ki.com/forums/uk-irela...-s2000-141597/

I have a little road trip to do, but given the weather will take the BEV
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nomadicS2k (07-26-2023)
Old 07-26-2023, 03:43 AM
  #35  

 
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Originally Posted by danwebster
Thats not strictly true - old fashioned pot pistons in 2618 with huge expansion rates with lots of clearance to the bore might knock, but modern slipper pistons in a properly machined bore don't knock.

OP - I build these engines for a living and work closely with Clockwise Motion (who are absolutely the best in the business) so If you need any help drop me a line.
Sorry I meant its what our forged engines do
Old 07-26-2023, 07:02 AM
  #36  

 
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K48?
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Old 07-26-2023, 10:33 AM
  #37  

 
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I wonder if that engine will ever get past just a pipe dream render, never seem to see any of it bar renders from years ago and nothing else.

And I do know someone that tried similar years ago and couldn't get it reliable - crank bearings end up too narrow to last...
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Old 09-13-2023, 06:33 AM
  #38  

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Well, I've been having zero fun with any engine builders via email all summer, so I think I'll try some phone calls when I'm back off holiday. Meanwhile, Tegiwa has 3 brand new, fully assembled F20c blocks for sale, which is becoming increasingly tempting, given the lack of response from any engine builders.

I'd probably rebuild my head with new valve guides, springs, some aftermarket cams (or do that to another 2nd hand head and keep my engine whole for selling). Add some ITBs and scavenging midpipe and call it a day. Little bit of power, great noise, and a lifetime of miles left in it.
Old 09-13-2023, 11:48 PM
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Tegiwa also have this

https://www.tegiwaimports.com/bourne...0l-engine.html

I'm sure I am ruinous for your mental health but in a friendly way
Old 09-14-2023, 03:17 AM
  #40  

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Hahaha! ​​​​​​
I did see that, but I don't know them at all, so skipped over it.


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